Login| Sign Up| Help| Contact|

Patent Searching and Data


Document Type and Number:
Japanese Patent JPH0148264
Kind Code:
B2
Abstract:
1. Process for the preparation of 1-naphthylamine-4,7-disulphonic acid by sulphonating 1-naphthylamine-7-sulphonic acid with oleum, working up the sulphonation mixture by introducing it into water, and isolating the 1-naphthylamine-4,7-disulphonic acid, characterized in that the oleum is added at a temperature from 10 to 70 degrees C, either simultaneously with the 1-naphthylamine-7-sulphonic acid to initially introduced sulphuric acid, or to the 1-naphthylamine-7-sulphonic acid, which is dissolved or suspended in sulphuric acid, and such a molar ratio of sulphur trioxide : 1-naphthylamine-7-sulphonic acid is used that 1.2 to 3 mols of sulphur trioxide are present per mol of 1-naphthylamine-7-sulphonic acid.

More Like This:
JP2010535167Caspase imaging probe
WO/2001/0309158-(ANILINO)-1-NAPHTHALENESULFONATE ANALOGS AND THEIR USE IN ANALYTE DETECTION ASSAYS
JP4244243Near-infrared absorbing polyazo compound and its manufacturing method
Inventors:
HAINTSU UURURITSUHI BURANKU
HORUSUTO BEERE
HANSU UEANAA RINDEN
UEANAA MENTSUERU
Application Number:
JP4851581A
Publication Date:
October 18, 1989
Filing Date:
April 02, 1981
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
BAYER AG
International Classes:
C07C309/47; C07C67/00; C07C301/00; C07C303/06



 
Next Patent: JPH0148265